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AssigneeThe Dow Chemical Company
InventorsRobert G. Bowman, David C. Molzahn, George E. Hartwell
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A process for reforming alkyleneamines to predominantly linearly-extended polyalkylenepolyamines comprising contacting an alkyleneamine or mixture thereof with a catalyst under conditions such that a mixture of polyalkylenepolyamines enriched in linearly-extended products is formed, said catalyst containing at least one compound selected from the group consisting of (a) Group VB metal oxides, (b) Group VB metal phosphates, (c) silicates of Groups IIA, IIIB, IVB, VB, and the lanthanide and actinide metals, and (d) tungsten oxides, with the proviso that the silicates and tungsten oxides are essentially free of aluminum. For example, ethylenediamine is contacted with a catalyst of niobium phosphate or niobic acid under reaction conditions to yield predominantly non-cyclic polyethylenepolyamines.
A process for reforming amines comprising contacting an alkyleneamine or mixture thereof with a catalytic amount of a thorium silicate catalyst under reaction conditions such that a mixture of polyalkylenepolyamines if formed which is enriched in linearly-extended homologues, with the proviso that the catalyst is essentially free of aluminum.
A process of preparing non-cyclic polyethylenepolyamines comprising contacting ethylenediamine, diethylenetriamine, or mixtures thereof with a catalyst containing thorium silicate in a continuous flow reactor at a temperature in the range from about 250.degree. C. to about 350.degree. C., a pressure in the range from about 1000 psig to about 2000 psig, and a flow rate from about 0.5 ml.sup.-1 hr.sup.-1 to about 5.0 g ml.sup.-1 hr.sup.-1 such that a mixture of linearly-extended polyethylenepolyamines is formed in a combined selectivity of about 75 weight percent.
Dependencies are inferred from the claim text.